Grinding arbor



Max'ch 289 i950 R. w FlsKE 2,501,669

GRINDNG ARBOR Filed April 14. 3,948 2 Sheets-Sheet l R. W. FISKE GRINDING ARBOR arch 287 1950 2 Sheets-Sheet 2 Filed April 14, 1948 Patented Mar. 28, 1950 NEED GRINDING ARBOR Roy W. Fiske, Salem, Oreg.

Application April 14, 1948, Serial No. 20,912

(Cl. Srl-272) Claims. l

My invention relates to grinding machines and more especially to grinding machines used to wet grind minerals, precious orl gem stones.`

An important object of the invention is to provide an improved, novel and simple housing structure for grinding arbors of such grinding machines in which the hood, bearing boxings to take standard bearings, and splash pan to receive and drain olic the water allowed to drip on the running grinding wheels or discs during the grinding operation, comprise a complete unit made in twov parts or sections in the form of castings bolted together at the boxings so that the same may be economically produced and easily assembled ordisassembled for replacing or renewing any worn parts such as grinding wheels or abrasive discs and bearings, while the arbor is equipped to be driven at different speeds and for mounting a polishing wheel and a sanding disc thereon.

To the foregoing objects, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be more specifin cally referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations, and modications may be resorted to which fall within the scope of the invention as claimed.

In the drawingsz.

Figure 1 is a front elevation partly in section, o f a grinding machine. embodying my invention.

Figure 2 is a transverse vertical sectional elevation taken on the line 2-2 of Figure l.

Figure 3 is a fragmentary longitudinal vertical section taken on the line 3 3 of Figure 2.

Figure 4 is a fragmentary sectional elevation taken on line d--d of Figure 1.

Figure 5 is a detail section taken on the line 5 5 of Figure 2.

Referring to the drawings, the housing Ii) is made up of two parts comprising a lower or base section I i and an upper section i2 forming a pan and hood or cover respectively. These sections are cast or otherwise formed of metal or other suitable materials disposed in abutting relation along their open upper and lower horizontal straight edges as indicated at I3. The lower or base section has attaching lugs Id at each end by which the housing may be anchored to a supm port or bench, a bottom l5 inclined rearwardly and relatively iiat at the back, but curved upwardly at the front and terminating in a projecting edge or ledge I6. An upwardly projecting rear wall l1 extends upwardly substantially perpendicularly to the bottom wall I 5 at the back thereof, and the end or side walls I 8 and I 9 of the base and hood' sections I I and l2 respectively are bulgedV out and diverge outwardly and downwardly respectively as seen in Figures 1 and 3 and are formed at the transverse centers, thereof with bearing boxing half sections. 20 above and below and meeting horizontally along and in line with the edges I3 to form bearing boxings, blocks or boxes 2 I. These bearing box- Ying sections 2Q are milled out interiorly as at 22,

the semi-circular cavities thus formed coacting to produce a circular or annular space for receiving standard anti-friction ball or roller bearings 23. cal bores 2t at each side of the cavities and beare ings to take bolts 25 for connecting the sections and clamping the outer races of the bearings stationary and against turning. End walls i8 g and I9 are also formed with central vertical reinforcing and strengthening ribs or webs 26; and 2l integrally cast therewith and the sections 20 of the bearing boxings 2i and with the arrangement of theend or side walls I8 and I9l gives maximum strength at the boxings. Centrallyof the length of the housing,v the back or rear wall I1 is provided with a drain hole or tube 2,8 sloping rearwardly at the bottom I5 of the pan formed by the lower or base section II, in which a drain plug 2S is threaded and adapted for attachment.

or connection of a suitable pipe iitting (not shown) to carry the used water off to a waste pipe.

The upper section I 2 forming the hood o r cover of the housing is substantially semi-circular and vis undercut or recessed to the abuttingy edge i3, across the front or bottom edge at 3i) and at theV sides or ends i9 of the upper or top section I2 as at 3i in an abrupt are or right angle so that the top of the hood or cover overhangs at the front.

1 The base or bottom pan forming section' Il is similarly cut out or recessed to the abutting edge I 3;A at the top or upper edge as indicated at I5 and at the ends as at 32 on abrupt arcs or obtuse angles slightly greater than right angles but the bottom l5 extends outwardly or forwardlyV of the hood or cover l2 with the upwardly projecting top front edge or ledge I6 considerably beyond or in front of the bottom front edge 3U and the top edges of the sides or ends IB extending forwardly beyond the ends or sides i9 and inclined forwardly at a suitable working angle below the front edge I6 and the cut-outs or recesses conform to produce an opening at the front through which the grinding wheels are accessible.

The arbor assembly 33 includes an arbol' or shaft 3d having a slightly enlarged portion 35 for avportion of its length between its ends on the central or intermediate portion of which a spool--y like sleeve or hub 36 is iixed or keyed as at 3l by a pin or set screw, spline, key or the like. The sleeve 3d has end anges 38 against which abra? sive grinding wheels or discs 3S are mounted and clamped between said flanged ends t and plates or discs il by nuts 1li on threaded end portions The 'boxing sections have aligned vertiv 42 of enlarged portion 35. Plates 4D and flanges 38 may be recessed on their inner faces to take intertting keys, washers or packings 43 on opposite projections on the hubs or sleeves of the grinding wheels 39 through the central holes in the latter serving as mounts for said wheels. Shaft 34 has reduced portions 44 and 45 beyond or outwardly of the ends of portion 35 which extend through the bearings 23 in the boxings 2| for rotation of the inner races of said bearings therewith without undue friction. Portion 44 may be longer than portion 45 for connection to suitable variable speed drive means, such as to take a `3- step or other variable pulley to take a motor or other suitable driven belt for varying the speed of rotation of the driven shaft or arbor 34. Shaft or arbor 34 has a reduced and threaded end portion 46 beyond or youtwardly of portion 44 to fixedly mount a polishing wheel and take a securing nut, and a reduced and threaded end portion 41 beyond or outwardly of portion 45 to fixedly mount a sanding disc and take a securing nut.

The spaced grinding wheels or discs 39 may be of suitable diameters, such as S-inch and 10- inch or otherwise and are enclosed by the housing I so as to be exposed or project into the front opening beneath the overhang 30 and 3I at the top or hood, and spaced from the depressed edges or ledges I6 and 32 where the ledge forms a hand, tool or stone or gem holder rest in grinding precious or gem stones or the like. Water is allowed to drip on the running grinding wheels in the customary way and will run down into the bottom section or pan of the housing which encloses the grinding wheels and arbor and provides protection of the artisan or workman. A guard 48 is also provided for each wheel and each consists of a curved or arcuate channel 49 open at both the front and rear ends and placed in spaced parallel and substantially concentric relation to each grinding disc or wheel 39 to receive the latter therein between the sides or flanges thereof as seen in Figures 2 and 3, and spaced therefrom as well as at the bight or connecting portions 50 forming the bottom walls or bases of the channels. The guards 48 are placed in spaced relation to and from the rear or back wall I'I of the lower or base section II on the bottom wall I5. The bight or connecting portions 50 forming the bottoms or bases of the guard or channels are also curved or arcuate and thickened toward the front to iit or rest on the bottom I 5 and conform thereto with the forward end portions of the channels 49 extending or diverging upwardly therefrom in front of the grinding wheels or discs 39 above the ledge I6 and edges of the sides I8 at the recesses or cut-outs 32 and the top or end edge 5| or forwardly inclined plane X thereof preferably offset or diverging downwardly from a radius line or plane Y between the axis Z of the grinding wheels, arbor or shaft 35 and all rotating and bearing parts at the longitudinal axis of the machine and touching or tangential to the top of edge 5I, at a small or sharp acute angle of substantially 5 degrees, which has been found best suited to the accurate and proper cutting or grinding of precious or gem stones, sanding and subsequent polishing thereof.

The forwardly thickened bottom or base 50 of each guard or channel is formed with a forwardly and upwardly extending lug or extension 52 diverging from the upwardly extending or curved forward and upper end portion of the channel but following or conforming to the curvature of the bottom I5 at the inside or top surface of the z as the grinding wheels, bearings, etc.

latter and terminating in spaced relation to and behind the front portion of bottom I5 and ledge I 6. Lug or extension 52 is provided with an elongated or longitudinally extending vertical slot 53 therethrough and is depressed or recessed along the slot at the top as at 54 to form upwardly facing side shoulders or seats 55 at each side of the slot, and a clamping bolt 56 is disposed upwardly through a hole 51 in the bottom I5 and slot 53 to take a nut 58 in the recess 54 at the top of the slot 53 on the seats or shoulders 55 and is restrained from turning by the sides of the slot or recess. By this means, the guards may be adjusted longitudinally thereof forwardly or rearwardly to position the end edge 5I in properposition and at the desired angle or inclination with respect to ledge I6 and the grinding discs or wheels 39 as seen in Figure 2 with the sides of the guard or channel upon and spaced from opposite sides of the wheel adjacent the periphery thereof and the connecting portion or bight 5I) similarly related to the peripheral edge of the disc to facilitate proper grinding action in cutting gem stones or the like.

Thus, it will be seen that I have provided an improved and simple grinding machine, particularly in the housing structure for a grinding arbor to enclose the grinding wheels and protect the operator while permitting proper accessibility for the grinding operation at the proper point or elevation on the grinding wheel and forwardly inclined angle with respect thereto below a radial line or plane between the high point of the channel guard or end edges of the flanges or sides thereof and the axis of rotation of the grinding wheel and arbor or shaft thereof. The housing and arbor assembly can be economically produced in quantities and easily assembled or disassembled for repair or replacement of parts such 'I'he housing is in two simple parts including the lower or bottom section or base forming the drain pan for carrying off the used or waste water and particles, and the upper section or hood, combined with the bearing boxes or boxings receiving the inserted bearings in one unit including the protective hood and water splash pan which can be readily drained.

I claim:

1. In a grinding machine, a housing including upper and lower sections in abutting relation, said lower section having a bottom and back extending upwardly therefrom to form a splash pan sloping rearwardly, a drain for said pan, said sections being formed with oppositely inclined ends with central half boxings in abutting relation, said boxings being interiorly recessed, bearings in said recesses, an arbor journalled in n`said bearings, means for driving the arbor at portions and extending above said edges with their upper ends inclined at a slightly greater angle than said edges.

2. In a grinding machine, a housing including upper and lower sections in abutting relation,

, said lower section having a bottom and back extending upwardly therefrom to form a splash pan sloping rearwardly, va drain for said pan, said sections being formed with oppositely inclined ends with central half boxings in abutting relation, said boxings being interiorly recessed, bearings in said recesses, an arbor journalled in said bearings, means for driving the arbor at variable speeds, grinding wheels fixed on the arbor, said sections having front cut-outs forming an opening with an upper overhang and the bottom being curved upwardly to form a ledge forwardly of the overhang, the top edges of the ends of the lower section at the opening sloping forwardly to and below the ledge at an acute angle to the horizontal, and guards comprising arcuate channels resting on a-nd adjustably secured to the bottom and curved upwardly at the front substantially concentric to the wheels and axis of the arbor and bearings to receive the peripheral edge portions of the wheels therein in spaced relation thereto, the upper ends of the channels extending above the said edges and inclined forwardly substantially at an angle of 5 from a radius .from the axis to the upper ends of the channel sides.

3. In a grinder for precious or gem stones, a housing comprising upper and lower half sec. tions disposed together horizontally at their edges, said upper section forming a hood and the lower section having an upwardly curved bottom sloping rearwardly and a back extending upwardly therefrom to form a pan, a drain for the pan at the juncture of the bottom and back, said sections having closed ends sloping toward the horizontal meeting line and formed with half boxings tted and bolted together and formed with interior coacting recesses, ball bearings in said recesses, said sections having front cut-outs extending into the ends forming an opening across the front of the housing with a top overhang and the bottom extending forwardly of the overhang to form a ledge, the top edges of the ends at the opening being inclined forwardly to the front below the ledge, said bearings adapted to rotatably receive an arbor mounting grinding wheels and adapted to be driven at variable speeds, and guards comprising arcuate channels fitting and resting on the forward portion of the bottom and being curved upwardly at the front above the ledge and being substantially concentric to the axis of the bearings to receive the peripheries of the grinding wheels therein at the opening, the upper ends of the channels being inclined forwardly at an acute angle to a radial plane from said axis to the top of the channel flanges, and means to secure the channels to the bottom for adjustment forwardly and rearwardly to adjust said guards as the wheels wear.

4. In a grinder for precious or gem stones, a housing comprising upper and lower half sections disposed together horizontally at their edges, said upper section forming a hood and the lower section having an upwardly curved bottom sloping rearwardly and a back extending upwardly therefrom to form a pan, a drain for the pan at the juncture of the bottom and back, said sections having closed ends sloping toward the horizontal meeting line and formed with intermediate vertical ribs and half boxings between said ribs fitted and bolted together and formed with interior coacting recesses, ball bearings in said recesses, said sections having front cut-outs extending into the ends forming an opening across the front of the housing with a top overhang and the bottom extending forwardly of the overhang to form a ledge, the top edges of the ends at the opening being inclined forwardly to the front below the ledge, said bearings adapted to rotatably receive an arbor mounting grinding wheels and adapted to be driven at variable speeds, and guards comprising arcuate channels tting and resting on the forward portion of the bottom and being curved upwardly at the front above the ledge and being substantially concentric to the axis of the bearings to receive'the peripheries of the grinding wheels therein at the opening, the upper ends of the channels being inclined forwardly at an acute angle -to a radial plane from said axis to the tops of the channel flanges, said channels having slotted extensions on the bottom, and clamping means carried by the bottom and engaging through the slots of said extensions to adjust the channels forwardly and rearwardly to raise or lower the upper ends thereof and inclination thereof.

5. In a grinder for precious or gem stones, a housing comprising upper and lower half sections disposed together horizontally at their edges, said upper section forming a hood and the lower section having an upwardly curved bottom sloping rearwardly and a back extending upwardly therefrom to form a pan, a drain for the pan at the juncture of the bottom and back, said sections having closed ends sloping toward the horizontal meeting line and formed with half boxings fitted together and formed with interior coacting recesses, ball bearings in said recesses, said sections having front cut-outs extending into the ends forming an opening across the front of the housing with a top overhang and the bottom extending forwardly of the overhang to form a ledge, the top edges of the ends at the opening being inclined forwardly to the front below the ledge, said bearings adapted to rotatably receive an arbor mounting grinding wheels and adapted to be driven at variable speeds, and guards comprising arcuate channels fitting and resting on the forward portion of the bottom and being curved upwardly at the front above the ledge and being substantially concentric to the axis of the bearings to receive the peripheries of the grinding wheels therein at the opening, the upper ends of the channels being inclined forwardly at an acute angle to a radial plane from said axis to the top of the channel anges, clamp means to secure the channels to the bottom for adjustment forwardly and rearwardly to adjust said angle, and bolts extending through aligned vertical holes through the half boxings outwardly of the bearings to connect said sections.

ROY W. FISKE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

